An Alaskan volcano 100 miles (160km) south-west of the state’s largest city, Anchorage, erupted overnight, sending a plume of smoke up to 15,000 metres (50,000ft) into the air.
Mount Redoubt experienced four large explosions late on Sunday and early today, according to geologists at the Alaska Volcano Observatory.
The observatory has issued a red alert, meaning eruption is imminent or under way, with significant emission of volcanic ash into the atmosphere likely.
An underwater volcano has erupted close to the Tonga coast, in the South Pacific ocean.
Scientists sailed to inspect the the volcano, which has been shooting smoke, steam and ash into the air near the low-lying twin volcanic islands of Hunga Tonga and Hunga Ha’apai.
Local authorities said coastal villages close to the active volcano were not yet at risk, and that no warnings had been issued.
Underwater volcano erupts off Tonga
Scientists sailed on Thursday to inspect an undersea volcano that has been erupting for days near Tonga, shooting smoke, steam and ash thousands of feet into the sky above the South Pacific ocean.
Chile’s Chaiten volcano, which erupted spectacularly last year, spewed a vast cloud of ash on Thursday in what appeared to be a partial collapse of its cone.
Television footage showed a could of ash billowing into the sky over the town of Chaiten, which lies about six miles (10 km) from the crater.
Authorities evacuated about 160 people from the area. Most of the town’s 4,500 residents were evacuated last year after the volcano, dormant for thousands of years, erupted. The government is planning to relocate the town.
A volcano near southwest Colombia’s border with Ecuador erupted on Saturday, leading the government to issue a “red alert” for the region.
There were not believed to be any fatalities or injuries in the blast, which happened at about 7:10 p.m. ET (12:10 a.m. Sunday GMT), said Carlos Lineras of the Colombia Institute for Geology and Mines.
